Description
In the Linux kernel, the following vulnerability has been resolved: net: systemport: Add global locking for descriptor lifecycle The descriptor list is a shared resource across all of the transmit queues, and the locking mechanism used today only protects concurrency across a given transmit queue between the transmit and reclaiming. This creates an opportunity for the SYSTEMPORT hardware to work on corrupted descriptors if we have multiple producers at once which is the case when using multiple transmit queues. This was particularly noticeable when using multiple flows/transmit queues and it showed up in interesting ways in that UDP packets would get a correct UDP header checksum being calculated over an incorrect packet length. Similarly TCP packets would get an equally correct checksum computed by the hardware over an incorrect packet length. The SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges when the driver produces a new descriptor anytime it writes to the WRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to re-organize its descriptors and it is possible that concurrent TX queues eventually break this internal allocation scheme to the point where the length/status part of the descriptor gets used for an incorrect data buffer. The fix is to impose a global serialization for all TX queues in the short section where we are writing to the WRITE_PORT_{HI,LO} registers which solves the corruption even with multiple concurrent TX queues being used.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
80105befdb4b8cea924711b40b2462b87df65b62 to < 8ed2f5d08d6e59f8c78b2869bfb95d0be32c094caffected80105befdb4b8cea924711b40b2462b87df65b62 to < de57f62f76450b934de8203711bdc4f7953c3421affected80105befdb4b8cea924711b40b2462b87df65b62 to < f3fde37d3f0d429f0fcce214cb52588a9e21260eaffected80105befdb4b8cea924711b40b2462b87df65b62 to < 595a684fa6f23b21958379a18cfa83862c73c2e1affected80105befdb4b8cea924711b40b2462b87df65b62 to < c675256a7f131f5ba3f331efb715e8f31ea0e392affected80105befdb4b8cea924711b40b2462b87df65b62 to < 6e1011cd183faae8daff275c72444edcdfe0d473affected80105befdb4b8cea924711b40b2462b87df65b62 to < eb4687c7442942e115420a30185f8d83faf37696affected80105befdb4b8cea924711b40b2462b87df65b62 to < 8b8e6e782456f1ce02a7ae914bbd5b1053f0b034affected
Linux Linux
Default version status: affected
3.16affected0 to < 3.16unaffected4.4.296 to ≤ 4.4.*unaffected4.9.294 to ≤ 4.9.*unaffected4.14.259 to ≤ 4.14.*unaffected4.19.222 to ≤ 4.19.*unaffected5.4.168 to ≤ 5.4.*unaffected5.10.88 to ≤ 5.10.*unaffected5.15.11 to ≤ 5.15.*unaffected5.16 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/8ed2f5d08d6e59f8c78b2869bfb95d0be32c094c ↗
- https://git.kernel.org/stable/c/de57f62f76450b934de8203711bdc4f7953c3421 ↗
- https://git.kernel.org/stable/c/f3fde37d3f0d429f0fcce214cb52588a9e21260e ↗
- https://git.kernel.org/stable/c/595a684fa6f23b21958379a18cfa83862c73c2e1 ↗
- https://git.kernel.org/stable/c/c675256a7f131f5ba3f331efb715e8f31ea0e392 ↗
- https://git.kernel.org/stable/c/6e1011cd183faae8daff275c72444edcdfe0d473 ↗
- https://git.kernel.org/stable/c/eb4687c7442942e115420a30185f8d83faf37696 ↗
- https://git.kernel.org/stable/c/8b8e6e782456f1ce02a7ae914bbd5b1053f0b034 ↗